{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Histone H2AC20—a variant of the canonical H2A featuring a unique C‐terminal region—functions as a versatile platform for integrating multiple posttranslational modifications that impact chromatin structure and nuclear processes. Modifications on H2AC20 include targeted proteolytic processing that promotes chromatin decondensation during neutrophil extracellular trap formation, thereby aiding in innate immunity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In addition, H2AC20 is a key substrate for ubiquitin ligases such as RNF8, RNF168, and Polycomb repressive complex components; its ubiquitination is required both to recruit DNA repair factors (e.g. 53BP1 and BRCA1) to double‐strand breaks and to sustain genome integrity"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ", and to establish repressive chromatin domains that underlie gene silencing programs during development and dosage compensation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Furthermore, the C-terminal region of H2AC20 contributes to the proper assembly of centromeric nucleosomes, which is essential for accurate chromosome segregation in mitosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Dynamic modifications such as acetylation and phosphorylation of H2AC20 further link cellular stress and energy status to chromatin remodeling and transcriptional activation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": " Finally, in immune cells, additional modifications including citrullination of histone H2A expand its role in modulating gene expression in response to inflammatory cues."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Collectively, these findings reveal that H2AC20 serves as a central nexus for epigenetic regulation, integrating diverse signals to control chromatin dynamics, coordinate DNA repair, and modulate transcriptional programs in both physiological and stress‐induced contexts.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Venizelos Papayannopoulos, Kathleen D Metzler, Abdul Hakkim, et al. 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